Well it's pretty easy:

Connect 12V and ground
Connect ibus with a pull-up resistor
Use NavCoder to talk to and program the nav

You'll observe:
1. You have no monitor, so you have to use the ibus to determine where the nav is at within its boot sequence
2. You'll have to manually respond to some requests from the nav during it's startup process. You'll see these :-) Refer to a captured log file of a car...
3. If loading OS, you'll have to emulate the BM button click to restart the nav.